The storm-track suppression over the western North Pacific from a cyclone life-cycle perspective

Abstract. Surface cyclones that feed the western part of North Pacific storm track and experience a midwinter suppression originate from three regions: East China Sea (?30? N), Kuroshio extension (?35? downstream Kamchatka (?53? N). In midwinter, in terms cyclone numbers, (45 %) (40 dominate region where eddy kinetic energy is suppressed, while relevance increases winter (15 to spring (20 %). The equatorward movement baroclinicity associated upper-level jet toward influence genesis regions different ways. January, are less numerous intense, their lifetime shortens, broadly consistent with reduced which they grow. opposite found for cyclones, live longer, more frequently explosive deepening. fraction particularly high January when benefit increased environment. Again, complex behavior cyclones. number increases, but decreases; on average reach higher intensity minimum sea level pressure, explosively deepening decreases latitude maximum growth occurs shifts equatorward. Therefore, life cycle seems be accelerated stronger earlier also shorter phase followed by an decay. Once suppressed baroclinic conversion efficiency strongly reduced. Together, this detailed life-cycle analysis reveals storm-track related fewer weaker intensifying then rapidly decaying branch partially opposes suppression. passing through over do not propagate far decay central Pacific. eastern requires further analysis.